Fiddle for Max 6 and Gen (mac)

Hi, does anyone know how I can get the fiddle object to work for 'Max 6 and Gen'. At the moment when I open 'fiddle~.help' and turn the output volume to 1, it doesn't want to pick up any external frequencies. When I was using Max 5, 30 day trial period, it worked then.

Cheers

Nikola